CN109231183A - A kind of citric acid is the carbon quantum dot and its preparation method and application of carbon source - Google Patents
A kind of citric acid is the carbon quantum dot and its preparation method and application of carbon source Download PDFInfo
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Abstract
The present invention relates to the carbon quantum dots and its preparation method and application that a kind of citric acid is carbon source.Citric acid is dissolved in polyethylene glycol and deionized water, gained mixed liquor is placed in reaction kettle, at 180 DEG C, is heated 3h, is cooled to room temperature, takes out reactant；Hexamethylene diamine is dissolved in step 1) gained reactant, then gained mixed liquor is placed in reaction kettle again, 11~14h is heated at 120 DEG C~160 DEG C, is cooled to room temperature, takes out reactant；Lysine is dissolved in step 2) gained reactant, then gained mixed liquor is placed in reaction kettle again, 12~15h is heated at 130 DEG C~180 DEG C, is cooled to room temperature, obtains target product carbon quantum dot.Process of the present invention is simple, has the characteristics that quick, easy to operate, yield is high, applied widely.
Description
Technical field
The invention belongs to Illuminant nanometer technical field of material, specifically using citric acid as carbon used in preparation carbon dots
Source prepares water-soluble fluorescent carbon quantum dot, and the application in quickly detection hexavalent chromium using solvent-thermal method.
Background technique
Cr with the development of the modern industry, in natural water and industrial wastewater6+Have become a big harm of environment.
Cr6+The industries such as mining, plating, Treatment of Metal Surface, process hides, printing and dyeing and casting are mainly derived from, in different concentration or pH
Under the conditions of, Cr6+With chromate (HCrO4-/CrO4 2-) and bichromate (Cr2O7 2-) form enter environment.Studies have shown that Cr6+
Have and is higher than Cr3+1000 times of carcinogenicity, and usually there is higher dissolubility, toxicity, unstability and bioactivity.People
Body is easy to absorb Cr6+, it can enter human body by approach such as alimentary canal, respiratory tract, skin and mucous membranes.When containing in air
Cr6+When, the Cr of various concentration6+Different degrees of loud and clear rear and Atrophic nasal mucosas can be generated, nasal septum is can also result in when concentration is high and wears
Hole and bronchiectasis etc..It can cause to spit inverse and abdominal pain when entering human body by alimentary canal.It can be produced when entering human body by skin
Rawhide inflammation and eczema.If contacting or being directly sucked in long or short term, endangers larger and have carcinogenic danger.Therefore, organism and ring
Cr in border6+Detection it is particularly significant.In recent years, Cr is detected6+Method mainly have Atomic absorption-emission spectrometry, spectrophotometric
Method, high performance liquid chromatography, electrochemical process and fluorescence analysis etc..
Fluorescence analysis is convenient because having, single-minded, is concerned the advantages that sensitive and in due course in situ detection.It is several recently
Year, the research of quantum dot is very active, and quantum dot is usually to extract in the mixture of cadmium and silicon, but this tittle from lead
Son point is general toxic, also there is very big harm to environment.The scientist of Clemson University of the U.S. produces a kind of novel for the first time
Carbon material-carbon quantum dot, similar with various metal quantum points, carbon quantum dot can issue bright in the case where illumination
Light.Member of the carbon nano-particles (Carbon Nanoparticles, CNPs) as nanometer family, be using carbon as skeleton structure,
Partial size is between 1-100nm, the nano material of shape almost spherical.And the partial size of carbon quantum dot (Carbon Dots, CDs) is logical
Often it is less than the carbon nano-particles of 10nm.Surface treatment and method difference used when carbon quantum dot are prepared, carbon nanometer is caused
The functional group that particle is included is different.Due to the partial size very little of carbon dots, quantum confined effect or dimensional effect can be generated, is made
It also has the characteristics that good biocompatibility and hypotoxicity while with photoluminescent property.Carbon quantum dot is partly led with traditional
Body quantum dot is compared, because its optical property is good, the advantages that bio-toxicity is small and good biocompatibility is more appropriately applied to give birth to
In terms of substance markers and in terms of imaging.And because it is with this excellent clear superiority of various aspects of performance, examined at present in analysis
The fields such as survey, cell imaging and optoelectronic sensor show large-scale influence power and huge application potential.
It is well known that synthesis carbon quantum dot method there are many kinds of, generally can be divided into 2 classes: from top to bottom synthetic method and from
Lower and upper synthetic method, method, which mainly passes through physical method or chemical method and peels off carbon from bigger carbon skeleton, from top to bottom receives
The synthetic method of rice corpuscles, usual this method yield is very low, and reaction time consumption is long, raw material costly, and be difficult by
Carbon skeleton is thoroughly ground into nanoparticle, therefore limits the further development of such method；And method emphasis is carbon from bottom to top
Change the molecule of organic carbon source and then form carbon quantum dot, the shortcomings that the method is have when preparing carbon quantum dot very big several
Rate, which can lose the non-carbonizable substance that can also cut much ice, causes the yield of its carbon quantum dot to reduce, but method but has from bottom to top
Have raw material sources extensive and cheap source, and carbon quantum dot generated time it is shorter the advantages that, so this synthetic method
It quickly grows, and the favor by experts and scholars.Method mainly includes laser ablation, electrochemical process etc. from top to bottom.From
Lower and upper method mainly includes hydrothermal/solvent thermal synthesis method, microwave method, ultrasonic method etc..
Summary of the invention
Hexavalent chromium is detected on the spot in time in order to solve the problem of that hexavalent chromium pollutes the environment, the present invention
A kind of new method preparing carbon quantum dot and quick detection hexavalent chromium using citric acid as raw material is provided.
The technical solution adopted by the present invention is that: a kind of citric acid is the carbon quantum dot of carbon source, and preparation method includes following step
It is rapid:
1) citric acid being dissolved in polyethylene glycol and deionized water, gained mixed liquor is placed in reaction kettle, at 180 DEG C,
3h is heated, is cooled to room temperature, reactant is taken out；
2) hexamethylene diamine is dissolved in step 1) gained reactant, then gained mixed liquor is placed in reaction kettle again, in
11~14h is heated at 120 DEG C~160 DEG C, is cooled to room temperature, and reactant is taken out；
3) lysine is dissolved in step 2) gained reactant, then gained mixed liquor is placed in reaction kettle again, in
12~15h is heated at 130 DEG C~180 DEG C, is cooled to room temperature, is obtained target product carbon quantum dot.
Further, a kind of above-mentioned citric acid is the carbon quantum dot of carbon source, in step 1), by volume, polyethylene glycol:
Deionized water 1:1.
Further, a kind of above-mentioned citric acid is the carbon quantum dot of carbon source, in mass ratio, citric acid: hexamethylene diamine: relying ammonia
Acid=1:(1-2): (0.1-0.2)；It is furthermore preferred that citric acid: hexamethylene diamine: lysine=1:1.56:0.11.
Above-mentioned citric acid is the carbon quantum dot of carbon source in specific detection Cr6+Application in ion.Method is as follows: Yu Han
There is Cr6+In the solution of ion, the carbon quantum dot that above-mentioned citric acid is carbon source is added, measures the variation of fluorescence intensity.
The beneficial effects of the present invention are: it is of the invention, disclose a kind of new method of quickly detection hexavalent chromium.Pass through this
The method of invention, can be by Cr6+Detection limit be reduced to 5.2 × 10-8mol/L.With the preparation of other carbon quantum dots and Cr6+Detection
It compares, process of the present invention is simple, has the characteristics that quick, easy to operate, yield is high, applied widely.It is prepared by citric acid
The carbon quantum dot that the method for carbon quantum dot is got has preferable water-soluble, relatively narrower size layout and photoluminescent property not
The advantages that easy fluctuation, detection limit are low, time-consuming short, selective high and strong interference immunity, and can be adapted for any containing Cr6+
Solution in detected.
Detailed description of the invention
Fig. 1 is the UV-visible spectrum of carbon quantum dot prepared by embodiment 1.
Fig. 2 is the TEM figure of carbon quantum dot prepared by embodiment 1.
Fig. 3 is the X-ray powder diffraction figure of carbon quantum dot prepared by embodiment 1.
Fig. 4 is Fourier's infrared spectrum of carbon quantum dot prepared by embodiment 1.
Fig. 5 is the XRD diagram of carbon quantum dot prepared by embodiment 1.
Fig. 6 a is the carbon quantum dot of the preparation of embodiment 1 in various concentration Cr6+Fluorescence intensity influence diagram under the conditions of existing.
Fig. 6 b is the carbon quantum dot of the preparation of embodiment 1 to Cr6+The linear relationship chart of concentration.
Fig. 7 is ultraviolet-visible absorption spectroscopy comparison diagram of the carbon quantum dot of the preparation of embodiment 1 in the case where there is other ion interferences.
Fig. 8 is the cytotoxicity test figure of carbon quantum dot prepared by embodiment 1.
Specific embodiment
Embodiment 1
(1) a kind of citric acid is the preparation method of the carbon quantum dot of carbon source
(1) mixed solution that 540mg citric acid is dissolved in 25mL polyethylene glycol and deionized water (volume ratio 1:1) is weighed
In, then gained mixed liquor is added in the hydrothermal reaction kettle that capacity is 30mL, electric heating constant temperature drum is placed under conditions of 180 DEG C
Heating reaction 3h in wind drying box, after being cooled to room temperature, takes out yellow reaction liquid；
(2) it weighs 840mg hexamethylene diamine to be dissolved in the yellow reaction liquid of step (1) acquisition, then again by gained mixed liquor
It is added in the hydrothermal reaction kettle that capacity is 30mL, is placed under conditions of 140 DEG C in electric heating constant-temperature blowing drying box and heats reaction
13h after being cooled to room temperature, takes out reaction solution；
(3) it weighs 58.4mg lysine to be dissolved in the reaction solution of step (2) acquisition, then gained mixed liquor is added again
In the hydrothermal reaction kettle for being 30mL to capacity, heating reaction 14h in electric heating constant-temperature blowing drying box is placed under conditions of 160 DEG C,
After being cooled to room temperature, obtained yellow clarified solution body, as target product citric acid are the carbon quantum dot of carbon source.
(2) it characterizes
1, a certain amount of prepared carbon quantum dot solution is chosen, detection UV absorption wavelength is carried out, as a result such as Fig. 1.
As seen from Figure 1, there is an apparent ultraviolet absorption peak at 340nm, this absorption peak is the C=O due to CDs
Caused by n- π * transition.Then, the photoluminescent property of carbon quantum dot aqueous solution has been investigated.And in the irradiation of ultraviolet lamp 365nm wavelength
Under, solution shows strong blue-fluorescence.
2, obtained carbon quantum dot is subjected to transmission scan irradiation, as a result such as Fig. 2.
As seen from Figure 2, carbon quantum dot prepared by the present invention is monodispersed, and each carbon quantum dot is similar to ball
Shape.In order to obtain the partial size of carbon quantum dot, by obtaining carbon amounts prepared by the present invention after carbon quantum dot prepared by calculating 200
The partial size of son point is about between 3-8nm.
3, obtained carbon quantum dot is subjected to X-ray powder diffraction detection, as a result such as Fig. 3.
As seen from Figure 3, prepared carbon quantum dot has apparent characteristic peak at 2 θ=22 °, illustrates that carbon dots have without fixed
The structure of the random arrangement of the structure of type carbon, i.e. carbon atom.
4, obtained carbon quantum dot is subjected to Fourier's infrared detection, as a result such as Fig. 4.
Structural characterization test carried out with infrared spectroscopy to carbon quantum dot, study functional group's type entrained by carbon quantum dot and
Detailed features, Fig. 4 are Fourier's infrared spectrum of the carbon quantum dot prepared by carbon source of citric acid.From fig. 4, it can be seen that infrared spectroscopy
Middle display two oxygen-containing functional groups O-H and C=O, respectively at 3304cm-1Place and 1585cm-1Place shows the stretching vibration of O-H
The stretching vibration absorption band of absorption peak and C=O, in addition, infrared spectroscopy is shown in 2917cm-1Place shows the distinctive of-CH- and cuts
Formula vibration peak, and appear in 947cm-1Place is the stretching vibration peak of C-O-C, in conclusion depositing due to a large amount of O-H and-COOH
So that the water solubility of fluorescent carbon point is preferably.The groups such as the fluorescent carbon point carrying-CH ,-COO and C-O-C.
5, obtained carbon quantum dot is subjected to photo electron diffraction detection, as a result such as Fig. 5.
Characterization test has been carried out with XPS to the carbon quantum dot of preparation, study its surface chemical constituent and entrained official
It can roll into a ball, Fig. 5 shows that, there are C1s (283.0e V), N1s (397.0e V) and O1s (530.0e V) three typical features combine
It can peak.Energy peak is combined to carry out peak-fit processing three typical features of the carbon quantum dot, C1s contains at peak C=C, C-C, C-
Tetra- functional groups of N/C-O and C=O/C=N.And it includes C=O and C-O that the peak O1s, which contains there are two functional group,.N1s then has C-N knot
Structure.The characterization result of comprehensive infrared spectroscopy and XRD, amino, hydroxyl and the carboxyl that the surface of prepared carbon quantum dot is contained, it
Be conducive to the dissolubility and stability of carbon quantum dot in aqueous solution, and then expand the advantage of carbon quantum dot and actually answer
With.
Embodiment 2 is the carbon quantum dot of carbon source in specific detection Cr using citric acid6+In application
(1) various concentration Cr6+Carbon quantum dot fluorescence intensity is influenced under the conditions of solution is existing
Take the Cr of 1mL various concentration range6+Solution, it is the carbon amounts of carbon source that addition 1mL concentration, which is the citric acid of 20 μm of ol/L,
Son point aqueous solution, measures the variation of its fluorescence intensity.It observes its detection sensitivity and calculates the carbon quantum dot to Cr6+Detection
Limit.
As shown in Fig. 6 a, work as Cr6+Concentration ascending sequence when carbon quantum dot aqueous solution is added, fluorescence intensity by
Gradually reduce.As shown in Figure 6 b, in the Cr that concentration range is 2-16mg/L6+In solution, the fluorescence intensity and Cr of decline6+Solution is dense
Good linear relationship, the equation of linear regression of resulting standard curve are as follows: y=-0.0212x+1.0023, linear phase is presented in degree
Relationship number R2=0.9859, is computed the Cr6+Detection be limited to 5.2 × 10-8Mol/L, the result shows prepared by the present invention
Carbon quantum dot can be very good as detection Cr6+Fluorescence probe.
(2) carbon quantum dot fluorescence intensity is influenced under the conditions of different metal ions are existing
In order to verify selectivity and sensitivity of the fluorescent carbon quantum dot to different metal ions of preparation, different metal from
Subsample is configured to each metallic solution that concentration is 20 μm of ol/L and probes under identical interfering ion concentration and reaction condition
Influence of the different metal to prepared carbon quantum dot fluorescence intensity.Selected concentration is the Pb of 400 μm of ol/L2+, Zn2+, Ag+, Co2+, Cr3+, Ca2+, Cu2+, Cd2+, Mg2+, Hg2+And Cr6+11 kinds of different metal ions of solution probe into system of the present invention
Each interference example solution is mixed respectively at carbon quantum dot solution to the selectivity of metal ion, stands ten by standby carbon quantum dot
Minute after solution reaction is complete, with its fluorescence intensity respectively of fluorescent spectrophotometer assay.
As shown in Figure 7, the initial fluorescent intensity value F of carbon quantum dot0It indicates, the carbon quantum dot after different ions are added
Fluorescence intensity level is indicated with F.By calculating different each F and F0Difference, can compare except Cr6+Outside, remaining metal from
Son cannot be such that the fluorescence intensity of carbon dots substantially change, and have only and Cr is added6+The quenching efficiency of its fluorescence intensity reaches afterwards
Nearly 70%.The result shows that carbon quantum dot prepared by the present invention is for Cr6+There is extraordinary selectivity.This result makes the carbon dots
It can be applied to Cr6+Detection.
(3) using citric acid as the Study of cytotoxicity of the carbon quantum dot of carbon source
Toxic cell glioma (U87MG) cell is cultivated at 37 DEG C in cell culture medium, in cell culture medium
The carbon quantum dot solution that carbon dots concentration is respectively 0.1,1,10 and 100 μm of ol/L is added, culture surveyed cell after 24,48 and 72 hours
OD value, then calculate and cell survival rate and spectrogram be made, as a result as shown in Figure 8, it is obvious that after carbon quantum dot solution is added,
The cell survival rate of carbon dots in culture medium is up to 78% or more, it was demonstrated that and the carbon quantum dot not only has a good fluorescence property,
And there is good biocompatibility, can be used to detect Cr in biology and medicine in environment6+Ion, and in Cr6+Ion
Detection field has potential application.
Claims (5)
1. the carbon quantum dot that a kind of citric acid is carbon source, which is characterized in that preparation method includes the following steps:
1) citric acid being dissolved in polyethylene glycol and deionized water, gained mixed liquor is placed in reaction kettle, at 180 DEG C, heating
3h is cooled to room temperature, and takes out reactant；
2) hexamethylene diamine is dissolved in step 1) gained reactant, then gained mixed liquor is placed in reaction kettle again, in 120 DEG C
11~14h is heated at~160 DEG C, is cooled to room temperature, and reactant is taken out；
3) lysine is dissolved in step 2) gained reactant, then gained mixed liquor is placed in reaction kettle again, in 130 DEG C
12~15h is heated at~180 DEG C, is cooled to room temperature, is obtained target product carbon quantum dot.
2. the carbon quantum dot that a kind of citric acid according to claim 1 is carbon source, which is characterized in that in step 1), by body
Product ratio, polyethylene glycol: deionized water 1:1.
3. the carbon quantum dot that a kind of citric acid according to claim 1 is carbon source, which is characterized in that in mass ratio, lemon
Acid: hexamethylene diamine: lysine=1:(1-2): (0.1-0.2).
4. any citric acid of claim 1-3 is the carbon quantum dot of carbon source in specific detection Cr6+Application in ion.
5. application according to claim 4, which is characterized in that method is as follows: in containing Cr6+In the solution of ion, it is added
Any citric acid of claim 1-3 is the carbon quantum dot of carbon source, measures the variation of fluorescence intensity.
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| CN112126431A (en) * | 2020-09-29 | 2020-12-25 | 南京理工大学 | Preparation method and application of carbon quantum dot modified black phosphorus quantum dot nano particle material |
| CN113981481A (en) * | 2021-09-27 | 2022-01-28 | 西安电子科技大学 | Preparation method and application of copper nanoparticle-loaded one-dimensional carbon-based nano material |
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| CN113981481A (en) * | 2021-09-27 | 2022-01-28 | 西安电子科技大学 | Preparation method and application of copper nanoparticle-loaded one-dimensional carbon-based nano material |
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